Abstract : The Army is fielding a new digital communications system, the TACFIRE system, shown for the brigade-area in Figure 1. In order to investigate the command, control, and communications issues associated with the new devices, the Artillery Command Environment (ACE) was developed. ACE is a real-time, multiplayer, interactive simulation system run on a commercial computer that interfaces with the tactical equipment through a bit box (modem). This paper discusses the preparations, experimental design, data collection, analysis methods, and results for the first experiment with military players interfaced with the Artillery Control Environment software conducted 8 May - 10 June 83. (Author)